Is it true cop radar guns don’t work in rain or darkness?

Q: I heard that radar speed guns used by the State Patrol don’t work in the dark or in the rain. Is that true?

A: No.

“Our radar and LIDAR units do work in the dark, rain and even fog,” State Patrol Trooper Dan McDonald said. “It’s concerning that you were asked that question because those are three major conditions of limited visibility and poor driving conditions.

“In these conditions motorists shouldn’t worry about getting caught speeding, they should naturally slow down for their safety and the safety of other motorists and pedestrians around them.”

LIDAR stands for light detection and ranging, and is used in place of a radar gun.

Thanks to the people who submitted questions. Previous answers are linked below.